Compound locomotive-engine



(No Model.) 5 Sheets-Sheet 1,

F. W. DEAN.

r GOMPOUND LOGQMUTIVEBNGINE. No. 507,353. Patented Oct. 24, 1893.

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GOMPOUND LOGOMOTIVE ENGINE. y No. 507,353. Patented Oct. 24, 1893.

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GOMPOUND LOGOMOTIVE ENGINE.

No. 50'7',353.A Patented Oct. 24,1893.

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FRANCIS W. DEAN, OF CAMBRIDGE, MASSACHUSETTS.

COMPOUND LOCOMOTIVE-ENGINE.

SPECIFICATION forming part of Letters Patent No. 507,353, dated October 24, 1893.

Application filed April 12, 18 93- To all whom it may concern:

Be it known that I, FRANCIS WINTHROP DEAN, of Cambridge, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements 1n Compound Locomotive-Engines, of which the following, taken in connection with the accompanying drawings, is a specification.

My invention relates to compound locomotlve engines, and is an improvement upon the inventions described in the Letters Patent Nos. 459,779 and 474,000, granted to me September 22, 1891and May 3, 1892, respectively; and it consists in certain novel features of construction, arrangement and combination of parts, which will be readily understood by reference to the description of the accompanying drawings, and to the claims at the end of this specification, in which my invention is clearly pointed out.

Figure 1 of the drawings is a vertical transverse section through the smoke box and high and low pressure cylinders of a compound locomotive, illustrating my invention, the cutting plane being through the exhaust passage of the high pressure cylinder and the steam passage leading to the low pressure cylinder. Fig. 2 is a similar section through the high pressure cylinder, its steam chest, valve, steam chest cover, and the intercepting valve, drawn to an enlarged scale, the cutting plane being on line 1, 1, on Fig. 3. Fig. 3 is a vertical longitudinal section through the same parts on line 2, 2, onFig. 2,.the cylinder heads and the valve stem being removed. Fig. 4 is a vertical transverse section of the high pressure cylinder and the converting valve, on line 3, 3, on Fig. 3. Fig. 5 is a plan of the high pressure cylinder, with the steam chest and valve removed. Fig. 6 is a horizontal section through the steam and exhaust passages of said cylinder on line 4., 4, on Fig. 3. Fig. 7 is a horizontal section through the steam chest cover on line 5, 5, on Figs. 2 and 4. Fig. 8 is a plan of the steam Valve for the high pressure cylinder. Fig. 9 is a horizontal section through the intercepting and converting valve casings on line 6, 6, on Fig. 3. Fig. 10 is a horizontal section through the intercepting andconverting valve casing on lineV 7, 7, on Fig. 3.

stanno. 470.084. (No model.)

ln the drawings A is the boiler shell cut in section transversely through the smoke box, see Fig. l. Bis the high pressure cylinder cast in one piece with the steam and exhaust passages and the saddle B for securing it to the boiler, and C is the low pressure cylinder cast in one piece with the steam and exhaust passages and the saddle or bracket C for securing it to the boiler. The high pressure cylinder B is provided with the two steam ports c and a. and steam passages b and b of usual construction, and in lieu of the ordinary exhaust port and passage is'provided with the exhaust passage D communicating at one end with the pipe E in the smoke box of the boiler, and at the other end through a passage -c in the steam chest casting F entirely outside of the steam chamber, with the passage d in the steam chest cover G, as shown in Figs'. 1 and 2. The coverGris ahollow casting provided with the bottom plate G which has formed therein the port c, communicating with the shallow oblong chamber c', which in turn communicates through the circular opening f with the passage d, as shown in Figs. 1, 2, and 3. The chamber e has a lateral extension c2 which communicates through the small hole c3 with a corresponding passage fin the converting valve casing, which communicates, at its upper end, through the horizontal hole f2 and vertical groove f3 with the interior of the converting valve casing H, above the piston H as and for the purposes hereinafter described. The cover Galso has formed therein the chambers g, g', which communicate through the openings h h with the interior of the steam chest outside of the valve I as shown in Figs. 3 and 7. The top plate of the steam chest cover G has. formed therein the large circular opening h', in axial line with the circular opening f, and with the smaller opening h2 communicating with one of the chambers g as shown in Fig. 3. The steam valve Iis rectangular in outline and has a rectangular opening I entirely through the same the two longer bars of said valve being connected together by a series of tie ribs of less height than the depth of said valve as shown in Figs. 1, 2, 3, and 8. The upper side of the valve I has formed therein grooves it' to receive IOO the packing t" t" which act against the ground under side of the plate G' of the cover G as shown.

H is the casing of the intercepting and converting valves, cast in one piece, and bolted to the top ofthe steam-chest cover so as to cover the openings Zt and h2 and the hole e2 as shown in Figs. l, 2, 3, and 4. The casing H has formed therein the intercepting valve cylinder j and the converting valve cylinder 7i: having theiraxes parallel to each other, and each bored out to two different diameters and having their upper ends closed by the caps H2 and H3 respectively.

`J is the intercepting valve secured to the lower end of the tubular stem J, the upper end of which is enlarged to fit the diameter of the enlarged upper portion of the cylinder y and Aform a piston J2 of small area, said piston and its stem being provided with packing rings Z and grooves Z substantially as in my prior patent, No. 474,000, before cited. The cap H2 has formed in one piece therewith the pendent tube J2, the lower end of which has screwed therein the pliigj, through which is made a small vent hole j2, and said tube has formed therein near its lower end a pluralityof lateral openings 7c 7.a opening into the cii'cuinferential groove k2 surrounding said tube,and, at its junction with the cap H2, with the small lateral orifice 7e3, which communicates with the cylinder y' above the upper end of the piston J 2. The valve stem J also has formed therein a plurality of lateral openin gs Z2 Z2 which communicate with the circumferential groove Z3 surrounding said stem, and which when the valve J has descended till its outer edge is within the annular rib or lip m surrounding the valve seat m will be in such position relative to the under side of the casing H and the groove k that the steam in the tubeJ2 can pass freely through the holes k It and Z2 Z2 into the exhaust passage (Z. The boi'e Z4 of the tube J3 extends in a semicircular form through the cap H2 and registers with the upper end of the passage m2 formed in the casing H between the cylinders]` and 7c and connected at its lower end with the chamber surrounding the converting valve n as shown in Fig. 3. rlhe converting valve a is secured to the lower end of the stein K, to the upper end of which is secured the piston H fitted to the enlarged upper portion of the cylinder 7c. The piston H has formed in its periphery aseries of small packing grooves o and the larger groove o', designed to receive any steam which may leak past the packing above it, and from which said steam may escape into the air through the hole o2 when the piston I-I is in its lowest position as shown in Fig. 3. The stem K has its central portion reduced in diameter as shown at p and has formed in its larger portions a series of small packing grooves to prevent, or minimize, the leakage of steam past the same. The casing H has formed therein, opposite the stem K, a hole p2 through which any steam in the passage m2 may escape into the atmosphere when the valve n is on its seat, as shown in Fig. The casing H is also provided with asocket q, from which a small orifice q' opens into the interior of the cylinder j, at the lower end of the larger portion thereof, as shown in Fig. 2, and a pipe q2 has one end screwed into said socket, the other end of which communicates with the interior of the steam space of theboiler,so that live steam is always in directcommiinication with the interior of the cylinder j, beneath the piston J2.

The pipe E communicates with the forked receiver pipes E', constructed substantially the same as in my before cited Patent UNO. 459,779, and leading to and discharging into the steam passage E2 of the low pressure cyl inder C, the exhaust steam from which is discharged into the smoke stack through the pipe E2, as in my said prior patent. The main steam pipe leading from the steam space of the boiler at A is connected at its other end to the pipe A2 of the saddle B of the high pressure cylinder and communicates with the steam passage B2, which, in the cylinder casting has two branches extending transversely of said cylinder and connected togethenat the saddle end of said casting by a section parallel to the axis of said cylinder, as shown in Fig. 6. The caps H2 and H2 arc provided with the holes o and fr' respectively, to re ceive oil cups, not shown.

The operation of my invention is as follows: The several parts being inthe positions shown in the drawings, and in a state of rest, if it is desired to start the engine, the throttle valve is opened, when steam from the boiler flows through the inain steam pipe into the passage B2, the interior of the steam chest at the front and rear of the valve I, and into the chambers g and g in the steam chest cover G, and, acting upon the converting valve a moves it upward away from its seat, iillstl'ie passage m2, Z4, flows through the orifice L72 iii the plugj into the space between the end of the tube J2 and the intercepting valve J, and at the same time the live steam passes through the orifice k2 into the space above the piston J 2, the combined pressure of the steam on the upper end of said piston and the valve J beneath the tube J2 causing said valve J to be moved downward, slowly, against the press ure of the steam in the cylinder beneath the piston J2, until the outer edge of the valve J is partially within the annulai' lip m, when the lower edge of the circumferential groove Z3 in the periphery of the stem J will have passed below the lower end of the casing H and the openings Z2 Z2 through said stem will be opposite, or nearly so, to the circumferential groove k2 and openings la in the lower end of the tube J2, when the live steam will flow freely into the passage (Z, forcing said valve J firmly upon its seat m', and thence fiowing through the passages c and D, the pipe E, receivers E and the passage E2 to the in IOS EIO

terior of the steam chest of the low pressure engi-ne, whence it flows into the low pressure cylinder C, if the valve of said cylinder is in the proper position to ad mit of such passage, and starts or assists in starting the engine, substantially as in my before cited prior patents. If the crank of the high pressure engine should happen to be upon one or the other of its dead centers, the engine will be started by the action of the live steam upon the piston of the llow pressure engine, automatically directed thereto as above -set forth, but if the said high pressure crank should be in a favorable position, the boilerl steam after being admitted to the steam chest of the high pressure cylinder will ow through one of the ports a or a and passages h or b to one or the other end of the interior of the cylinder B, according to the position of the valve I and act upon the piston of said high pressure cylinder to start the engine at the same time that a portion of said steam Iiows into the low pressure cylinder as above described to assist in said starting. As soon as the engine is started and the high pressure piston has completed a stroke in one direction and commences to exhaust, the steam escaping from said cylinder flows upward through the central opening in the valve I, through the port e into the chamber e', e2 and a portion of it Hows through the passages e3 and f', the hole f2 and groove or channel f3 to the upper side of the piston H', and, acting upon the large area thereof overcomes the pressure of the live steam on the under surface of the converting valve n, and kforces said piston and valve downward till the valve n finds its seat and closes the passage h2 when the live steam in the passages m2 and Z4 will escape into the atmosphere, through the opening p2, and the pressure of the boiler steam in the cylinder j beneath the piston J 2 will move the intercepting valve J upward into the position shown in the drawings where it will be maintained by the constant pressure of said boiler steam, and no more live steam will find its way to the low pressure cylinder until it becomes necessary to again start the engine from a state of rest. The intercepting valve is prevented from slamming in its downward movement by the fact that the steam that moves it is wire-drawn through the small holes k3 and jz, and the cushioning eifect of forcing steam from the cylinder j into the boiler, and is also prevented from slamming in its upward movement by forcing steam backward through these same holes k3 and ,7'2 into the passage Z4. The intercepting and converting valves operate substantially as described in my before cited prior Patent No. 474,000, and only such changes are made in their construction as are made necessary by the change in location and combining them in one casing, except the change in the details of the lower end of the tube J 3 as shown.

What I claim as new, and desire to secure by Letters Patent of the United States, is=

ber above said plate; an opening from said f v chamber provided with a valve seat, and commuuicating with a passageleading tothesteam chest of the low pressure cylinder and witha corresponding opening through the top of said cover; a valve casingmounted on said cover and covering said opening through the top of same; and an intercepting valve carried .by said casing and arranged to co-,operate with said seat to close the passage from said chamber.

2. In a compound engine the combination of a high pressure cylinder having two steam ports, opening into the valve chamber of the steam chest, and a port or passage leading from the surface upon which the steam chest rests outside of the valve chamber of the steam chest and extending to and communicating with the receivers in the smoke box; a steam chest having a valve chamber inclosing said steam ports and provided with a separate passage to coincide and communicate with the exhaust port in said cylinder; a slide valve having an exhaust passage entirely through the same; a hollow steam chest cover having a port in its bottom above the exhaust passage of said valve, a chamber above said port; a passage leading from said chamber to the independent passage through said steam chest casting and provided with a circular valve seat. above said port, and a large and small opening in its top plate; and an intercepting valve and aconverting valve mounted in independent cylinders, formed in a Single casing, with their axes parallel, said casing being ymounted. upon the steam chest cover substantially as described.

3. In a compound locomotive engine thecoinbination with the steam supply pipe and the receivers located inthe smoke box, of the high pressure cylinder B provided withl the steam ports a, ct and steam passages b b and B2, and the exhaust passage D; the steam chest F having a valve chamber and the passage c; the valve I having au exhaust opening through the same; th'e hollow steam chest cover G. provided with the bottom plate G',

the port e cut through said plate, the cham-Y ber e with the extension e2., the passage f pro,- vided with the valve seat m', the passage d the chambers g and g', and the larger and smaller discharge openings h and h2; the casing H having formed therein two cylindrical chambers j and lowith their axes parallel; theintercepting valve J, mounted upon a stemv fitted to one of said cylinders, and arranged -to cooperate with the seat m to close the pas- IOO and having the piston ll' secured to its upper end; and a passage leading from the chamber e e2 to the upper end of the cylinder la.

4. In a compound engine the combination with the high pressure cylinder, its steam chest7 and a slide valve having an exhaust opening `extending entirely through the same, of the hollow steam chest cover G provided with the bottom plate G', the exhaust port e, chambers e', e2, and g, g', an exhaust passage connected in any suitable manner to the re eeivers and thence with the 10W pressure cylinder, the passages j', h and h2, the valve seat m', the intercepting valve J constructed and arranged to cooperate with the seat m to close the passage f, and the converting valve n constructed and arranged to close the passage h2, said valves being mounted upon stems provided with pistons tted to independent cylindrical chambers mount-ed upon said steam chest cover.

5. In a compound engine the combination of a high pressure cylinder having two steam ports a a; the exhaust passage D; the steam chest F having a valve chamber and the passage c outside of said valve chamber; a slide Valve having au exhaust passage entirely through it; asteam chest cover provided with the bottom plate G', the port e cut through said plate, the chamber e; the passage f leading from said chamber; the valveV seat m surrounding said passage f; `a valve for closing said passage f; and the passage d leading to, and communicating with the passage c through the steam chest casting.

In testimony whereof l havesigned `my name to this specification, in the presence of two subscribing witnesses, on this 10th day of April, A. D. 1893.

FRANCIS W. DEAN.

Witnesses:

N. C. LOMBARD, W. E. MATHEWs. 

